Hi Lemontree,

Very nice work .

In your last posting you mentioned about using black rubber sheet for cell spacer. KOH and NaOH are very nasty stuff. These two chemicals can corrode most of materials like rubber, glue, bronze and so on. My advice is mix some strong electrolyte (KOH or NaOH) and pour into glass container. Drop what ever material you need to use in your design into this electrolyte and leave for overnight.

The next day check the properties of the material. Some material like black rubber will start discoloration. This will make the electrolyte contaminated during electrolysis and the cell efficiency drops. For cell spacer, you may use vinyl (used in industrial refrigerator) to seal cold air. I find most of metals either react to KOH or NaOH (aluminium, nickel) to release hydrogen and other poisonous gas or starts to corrode (bronze, brass and so on).

Hopefully the above suggestions can help you to improve your electrolyser design. You may refer to my project page at links below :

1) 8 plate series cell
2) 13 plate series cell